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Loans Receivable and Allowance for Loan and Lease Losses Impaired Loans (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Mar. 31, 2019
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment | $ 9,549 |  | $ 9,549 |  | $ 12,369
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired Financing Receivable, Unpaid Principal Balance | 10,612 |  | 10,612 |  | 13,567
Impaired Financing Receivable, Related Allowance | 182 |  | 182 |  | 189
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 10,609 | $ 12,276 | 10,959 | $ 12,598 |
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |  |  |
Impaired Financing Receivable, Interest Income, Cash Basis Method | 44 | 54 | 112 | 68 |
One-to-four family |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 3,994 |  | 3,994 |  | 4,488
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 815 |  | 815 |  | 929
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 4,999 |  | 4,999 |  | 5,643
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 815 |  | 815 |  | 929
Impaired Financing Receivable, Related Allowance | 169 |  | 169 |  | 171
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 4,185 | 4,813 | 4,241 | 5,074 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 869 | 887 | 872 | 1,003 |
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 14 | 26 | 30 | 31 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 | 1 | 0 | 2 |
Multifamily |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 2,433 |  | 2,433 |  | 3,214
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 2,433 |  | 2,433 |  | 3,214
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 2,789 | 2,382 | 2,824 | 1,646 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 0 | 0 | 0 | 371 |
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 14 | 9 | 41 | 17 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 | 0 | 0 | 0 |
Commercial real estate |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 0 |  | 0 |  | 476
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 0 |  | 0 |  | 476
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 0 | 492 | 238 | 1,014 |
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 0 | 8 | 0 | 8 |
Business |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 1,418 |  | 1,418 |  | 1,974
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 889 |  | 889 |  | 1,288
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 1,476 |  | 1,476 |  | 2,017
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 889 |  | 889 |  | 1,288
Impaired Financing Receivable, Related Allowance | 13 |  | 13 |  | $ 18
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 1,699 | 652 | 1,696 | 623 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 1,067 | 3,050 | 1,088 | 2,867 |
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 16 | 6 | 41 | 6 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | $ 0 | $ 4 | $ 0 | $ 4 |

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